Dirt bike sprocket



FIG. 1 is front perspective view of a dirt bike sprocket showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof, to which the left side elevation view is a mirror image; and,

FIG. 5 is a top plan view thereof, to which the bottom plan view is a mirror image.

The broken lines in the drawings illustrate portions of the dirt bike sprocket that form no part of the claimed design. 

CLAIM The ornamental design for a dirt bike sprocket, as shown and described. 